I'm constantly being contacted through LinkedIn by recruiters who clearly haven't actually read my profile - they'll say they've read it and then say that they think I'd be perfect for the Senior Developer position they're hiring for, when my profile clearly has me as a student looking for entry -level positions. When I respond, or when they call me, I tell them my actual qualifications and they say that they'll definitely contact me in the future. To date I have not heard from a single one of them again.
I get exactly the effect you mention here all the time from LI: recruiter spam from people who tell me they've read my (junior dev) profile, then offer me Lead Dev positions for their young company, while at the same time saying the requirements for the role are 10 years of "progressive software dev experience" (which I don't have and is definitely apparent from my profile).
It's baffling. Don't tell me you've read my resume if you clearly haven't. These people are not helping themselves by blasting a canned message to those who match whatever keyword they're filtering for.
